Merge pull request #154 from nanan9177/tutorial

Added the new Artist 4 stage.
Merge pull request #155 from nanan9177/tutorial

Moving Stage 3 (Artist 4) to EC script for checking. Will bring it back ...
increase dev connection limit
create prize_providers and dummy prizes
prizes: phase 2 - view earned prizes and eligible prize providers on new /redeemprizes page
Merge branch 'master' of github.com:code-dot-org/dashboard
Translations
Try different GA tag to fix tracking issue
Fix read_pool syntax error (_ vs -)
Updated instructions for turtle 4.